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GameFly / GameFly UK has COD games on sale for 50% off along with some other deals.
Call of Duty $10 (Steam)
Call of Duty 2 $10 (Steam)
Call of Duty 4: Modern Warfare $10
Call of Duty: Black Ops $20 (Steam)
Call of Duty: Black Ops II $30 (Steam)
Call of Duty: Black Ops II Digital Deluxe Edition $40 (Steam)
Call of Duty: Ghosts Gold Edition $30 (Steam)
Call of Duty: Modern Warfare 2 $10 (Steam)
Call of Duty: Modern Warfare 3 $20 (Steam)
Call of Duty: United Offensive $10 (Steam)
Call of Duty: War Chest $15 (Steam)
Call of Duty: World at War $10
Car Mechanic Simulator 2014 $10 (Steam)